db2_special_columns

(PECL ibm_db2 >= 1.0.0)

db2_special_columns — Returns a result set listing the unique row identifier columns for a table

说明

db2_special_columns(
    resource $connection,
    ?string $qualifier,
    string $schema,
    string $table_name,
    int $scope
): resource

Returns a result set listing the unique row identifier columns for a table.

参数

connection

A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.

qualifier

A qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass null or an empty string.

schema

The schema which contains the tables.

table_name

The name of the table.

scope

Integer value representing the minimum duration for which the unique row identifier is valid. This can be one of the following values:

Integer value	SQL constant	Description
0	SQL_SCOPE_CURROW	Row identifier is valid only while the cursor is positioned on the row.
1	SQL_SCOPE_TRANSACTION	Row identifier is valid for the duration of the transaction.
2	SQL_SCOPE_SESSION	Row identifier is valid for the duration of the connection.

返回值

Returns a statement resource with a result set containing rows with unique row identifier information for a table. The rows are composed of the following columns:

Column name Description

SCOPE

Integer value	SQL constant	Description
0	SQL_SCOPE_CURROW	Row identifier is valid only while the cursor is positioned on the row.
1	SQL_SCOPE_TRANSACTION	Row identifier is valid for the duration of the transaction.
2	SQL_SCOPE_SESSION	Row identifier is valid for the duration of the connection.

COLUMN_NAME Name of the unique column.

DATA_TYPE SQL data type for the column.

TYPE_NAME Character string representation of the SQL data type for the column.

COLUMN_SIZE An integer value representing the size of the column.

BUFFER_LENGTH Maximum number of bytes necessary to store data from this column.

DECIMAL_DIGITS The scale of the column, or null where scale is not applicable.

NUM_PREC_RADIX An integer value of either 10 (representing an exact numeric data type), 2 (representing an approximate numeric data type), or null (representing a data type for which radix is not applicable).

PSEUDO_COLUMN Always returns 1.

参见

db2_column_privileges() - Returns a result set listing the columns and associated privileges for a table
db2_columns() - Returns a result set listing the columns and associated metadata for a table
db2_foreign_keys() - Returns a result set listing the foreign keys for a table
db2_primary_keys() - Returns a result set listing primary keys for a table
db2_procedure_columns() - Returns a result set listing stored procedure parameters
db2_procedures() - Returns a result set listing the stored procedures registered in a database
db2_statistics() - Returns a result set listing the index and statistics for a table
db2_table_privileges() - Returns a result set listing the tables and associated privileges in a database
db2_tables() - Returns a result set listing the tables and associated metadata in a database

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